diff --git a/include/ndn-cpp-dev/security/sec-tpm-file.hpp b/include/ndn-cpp-dev/security/sec-tpm-file.hpp
new file mode 100644
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+++ b/include/ndn-cpp-dev/security/sec-tpm-file.hpp
@@ -0,0 +1,115 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * @author: Xingyu Ma <maxy12@cs.ucla.edu>
+ *          Yingdi Yu <yingdi@cs.ucla.edu>
+ * See COPYING for copyright and distribution information.
+ */
+
+#ifndef NDN_SEC_TPM_FILE_HPP
+#define NDN_SEC_TPM_FILE_HPP
+
+#include "../common.hpp"
+
+#include "sec-tpm.hpp"
+
+namespace ndn 
+{
+
+class SecTpmFile : public SecTpm
+{
+public:
+  struct Error : public SecTpm::Error { Error(const std::string &what) : SecTpm::Error(what) {} };
+
+  SecTpmFile(const std::string & dir = "");
+
+  /**
+   * @brief destructor
+   */
+  virtual
+  ~SecTpmFile() {};
+
+  /**
+   * Generate a pair of asymmetric keys.
+   * @param keyName The name of the key pair.
+   * @param keyType The type of the key pair, e.g. KEY_TYPE_RSA.
+   * @param keySize The size of the key pair.
+   */
+  virtual void
+  generateKeyPairInTpm(const Name & keyName, KeyType keyType, int keySize);
+
+  /**
+   * Get the public key
+   * @param keyName The name of public key.
+   * @return The public key.
+   */
+  virtual ptr_lib::shared_ptr<PublicKey>
+  getPublicKeyFromTpm(const Name & keyName);
+
+  /**
+   * Fetch the private key for keyName and sign the data, returning a signature block.
+   * Throw Error if signing fails.
+   * @param data Pointer to the input byte array.
+   * @param dataLength The length of data.
+   * @param keyName The name of the signing key.
+   * @param digestAlgorithm the digest algorithm.
+   * @return The signature block.
+   */  
+  virtual Block
+  signInTpm(const uint8_t *data, size_t dataLength, const Name& keyName, DigestAlgorithm digestAlgorithm);
+
+  /**
+   * Decrypt data.
+   * @param keyName The name of the decrypting key.
+   * @param data The byte to be decrypted.
+   * @param dataLength the length of data.
+   * @param isSymmetric If true symmetric encryption is used, otherwise asymmetric encryption is used.
+   * @return The decrypted data.
+   */
+  virtual ConstBufferPtr 
+  decryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);
+
+  /**
+   * Encrypt data.
+   * @param keyName The name of the encrypting key.
+   * @param data The byte to be encrypted.
+   * @param dataLength the length of data.
+   * @param isSymmetric If true symmetric encryption is used, otherwise asymmetric decryption is used.
+   * @return The encrypted data.
+   */
+  virtual ConstBufferPtr
+  encryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);
+
+
+  /**
+   * Generate a symmetric key.
+   * @param keyName The name of the key.
+   * @param keyType The type of the key, e.g. KEY_TYPE_AES.
+   * @param keySize The size of the key.
+   */
+  virtual void 
+  generateSymmetricKeyInTpm(const Name& keyName, KeyType keyType, int keySize);
+
+  /**
+   * Check if a particular key exists.
+   * @param keyName The name of the key.
+   * @param keyClass The class of the key, e.g. KEY_CLASS_PUBLIC, KEY_CLASS_PRIVATE, or KEY_CLASS_SYMMETRIC.
+   * @return True if the key exists, otherwise false.
+   */
+  virtual bool
+  doesKeyExistInTpm(const Name& keyName, KeyClass keyClass);
+
+  std::string
+  nameTransform(const std::string &keyName, const std::string &extension);
+
+private:
+  void 
+  maintainMapping(std::string str1, std::string str2);
+  
+private:
+  class Impl;
+  std::auto_ptr<Impl> impl_;
+};
+}//ndn
+
+#endif